[Ordinary People Fun Day] The cast iron pot is a pot that directly melts iron into water and casts it into a mold. Before using it for the first time, you need to deal with it, so that an oxide film is formed on the surface to protect the rusty metal inside. If the cast iron pot is used and maintained, the oxide film in the pot will be very strong, which can completely replace the nonstick pot, and it will not be used for a lifetime.